Binary quadratic forms and ray class groups

Ick Sun Eum, Ja Kyung Koo, Dong Hwa Shin

Let $K$ be an imaginary quadratic field different from $\mathbb{Q}(\sqrt{-1})$ and $\mathbb{Q}(\sqrt{-3})$. For a positive integer $N$, let $K_{\mathfrak{n}}$ be the ray class field…